Joseph Leo Gormley (May 22, 1914 – June 6, 2004) was the chief of chemistry and toxicology for the FBI.
He spent more than thirty three years with the FBI, investigating some of the agency's most famous cases, including the Great Brinks Robbery in 1950 and the 1964 murders of three young civil rights workers, which became known as the "Mississippi Burning" case.
He served as an expert witness in numerous trials, testifying on his knowledge of chemistry, toxicology and arson.
For more than 20 years, Gormley supervised a program that developed the use of lie detector tests for investigative purposes.
After returning to the Washington, D.C., area he worked in the research and training divisions of the International Association of Chiefs of Police.